提高日粮中藻粉添加量对新产牛乳中DHA含量和转化效率的影响  

Effect of Increasing Addition of Algae Powder on the DHA Content and Conversion Efficiency of Milk in Newly Produced Cows

作　　者：金文华 巴根纳 陈冲 杜盛宏[4] 何剑 高瑞雄 谭伟 王鹏杰 王典 朱银华[1,2] JIN Wen-hua;BA Gen-na;CHEN Chong;DU Sheng-hong;HE Jian;GAO Rui-xiong;TAN Wei;WANG Peng-jie;WANG Dian;ZHU Yin-hua(National Center of Technology Innovation for Dairy,Hohhot 010110;Department of Nutrition and Health,China Agricultural University,Beijing 100193;Inner Mongolia Yili Industrial Group,Co.Ltd.,Hohhot 010110;Inner Mongolia Youran Dairy,Co.Ltd.,Hohhot 010070)

机构地区：[1]国家乳业技术创新中心,呼和浩特010080 [2]中国农业大学营养与健康系,北京100193 [3]内蒙古伊利实业集团股份有限公司,呼和浩特010110 [4]内蒙古优然牧业有限责任公司,呼和浩特010070

出　　处：《中国奶牛》2024年第6期8-12,共5页China Dairy Cattle

基　　金：国家乳业技术创新中心纵向项目(2023-JSGG-12)。

摘　　要：本试验旨在通过提高日粮中包被藻粉添加量,探究头胎新产和经产新产奶牛的牛奶中二十二碳六烯酸(DHA)含量和转化效率随时间变化的规律。试验结果表明,当藻粉添加量从165g/(头·d)提高到400g/(头·d)时,经产新产牛的牛奶DHA含量由5.15mg/100mL升高至10mg/100mL,DHA转化效率则基本保持不变,稳定在9.5%左右;头胎新产牛的牛奶DHA含量由7.76mg/100mL升高至9mg/100mL,而DHA转化效率随藻粉饲喂量增加下降明显,从15.9%降低至9.0%。由此可知,在产犊高峰期间增加经产新产牛藻粉饲喂量可作为一种避免全群牛奶DHA含量降低的手段。而对于头胎新产牛来说,增加藻粉饲喂量对牛奶DHA含量的提升作用有限,且严重降低DHA转化效率,造成原料浪费。因此,建议将头胎新产和经产新产奶牛分开管理,采用不同的藻粉饲喂量,以降低成本。This experiment was conducted to investigate the changes of docosahexaenoic acid(DHA)content and conversion efficiency in milk of primiparous and multiparous newly produced cows over time by increasing the amount of coated algal powder in diet.The results showed that when the algal powder added was increased from 165g/head/d to 400 g/head/d,the DHA content in milk of multiparous newly produced cows increased from 5.15 mg/100mL to 10 mg/100 mL,while the DHA conversion efficiency remained stable at about 9.5%.The DHA content in milk of primiparous newly produced cows increased from 7.76 mg/100 mL to 9 mg/100 mL,while the DHA conversion efficiency decreased significantly from 15.9%to 9.0%with the increase of algal powder feeding.It is concluded that increasing the algal powder feeding of multiparous newly produced cows during the peak of calves can be used as a mean to avoid the decrease of DHA content in milk of the whole group.For primiparous newly produced cows,increasing the algal powder feeding has limited effect on the increase of DHA content in milk,and seriously reduces the DHA conversion efficiency,resulting in waste of raw materials.Therefore,it is suggested to manage primiparous and multiparous newly produced cows separately and adopt different algal powder feeding amounts to reduce costs.

关 键 词：DHA 转化效率 包被藻粉 头胎新产牛 经产新产牛 

分 类 号：S823.4[农业科学—畜牧学]